public class BBVideoPlayer extends Activity { private VideoView mVideoView;private TextView tvcache;private String remoteUrl;private String localUrl;private ProgressDialog progressDialog = null; private static final int READY_BUFF = 2000 * 1024;private static final int CACHE_BUFF = 500 * 1024; private boolean isready = false;private boolean iserror = false;private int errorCnt = 0;private int curPosition = 0;private long mediaLength = 0;private long readSize = 0; @Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.bbvideoplayer);     findViews();    init();    playvideo();} private void findViews() {    this.mVideoView = (VideoView) findViewById(R.id.bbvideoview);    this.tvcache = (TextView) findViewById(R.id.tvcache);} private void init() {    Intent intent = getIntent();     this.remoteUrl = intent.getStringExtra("url");    System.out.println("remoteUrl: " + remoteUrl);     if (this.remoteUrl == null) {        finish();        return;    }     this.localUrl = intent.getStringExtra("cache");     mVideoView.setMediaController(new MediaController(this));     mVideoView.setOnPreparedListener(new OnPreparedListener() {         public void onPrepared(MediaPlayer mediaplayer) {            dismissProgressDialog();            mVideoView.seekTo(curPosition);            mediaplayer.start();        }    });     mVideoView.setOnCompletionListener(new OnCompletionListener() {         public void onCompletion(MediaPlayer mediaplayer) {            curPosition = 0;            mVideoView.pause();        }    });     mVideoView.setOnErrorListener(new OnErrorListener() {         public boolean onError(MediaPlayer mediaplayer, int i, int j) {            iserror = true;            errorCnt++;            mVideoView.pause();            showProgressDialog();            return true;        }    });} private void showProgressDialog() {    mHandler.post(new Runnable() {         @Override        public void run() {            if (progressDialog == null) {                progressDialog = ProgressDialog.show(BBVideoPlayer.this,                        "视频缓存", "正在努力加载中 ...", true, false);            }        }    });} private void dismissProgressDialog() {    mHandler.post(new Runnable() {         @Override        public void run() {            if (progressDialog != null) {                progressDialog.dismiss();                progressDialog = null;            }        }    });} private void playvideo() {    if (!URLUtil.isNetworkUrl(this.remoteUrl)) {        mVideoView.setVideoPath(this.remoteUrl);        mVideoView.start();        return;    }     showProgressDialog();     new Thread(new Runnable() {         @Override        public void run() {            FileOutputStream out = null;            InputStream is = null;             try {                URL url = new URL(remoteUrl);                HttpURLConnection httpConnection = (HttpURLConnection) url                        .openConnection();                 if (localUrl == null) {                    localUrl = Environment.getExternalStorageDirectory()                            .getAbsolutePath()                            + "/VideoCache/"                            + System.currentTimeMillis() + ".mp4";                }                 System.out.println("localUrl: " + localUrl);                 File cacheFile = new File(localUrl);                 if (!cacheFile.exists()) {                    cacheFile.getParentFile().mkdirs();                    cacheFile.createNewFile();                }                 readSize = cacheFile.length();                out = new FileOutputStream(cacheFile, true);                 httpConnection.setRequestProperty("User-Agent", "NetFox");                httpConnection.setRequestProperty("RANGE", "bytes="                        + readSize + "-");                 is = httpConnection.getInputStream();                 mediaLength = httpConnection.getContentLength();                if (mediaLength == -1) {                    return;                }                 mediaLength += readSize;                 byte buf[] = new byte[4 * 1024];                int size = 0;                long lastReadSize = 0;                 mHandler.sendEmptyMessage(VIDEO_STATE_UPDATE);                 while ((size = is.read(buf)) != -1) {                    try {                        out.write(buf, 0, size);                        readSize += size;                    } catch (Exception e) {                        e.printStackTrace();                    }                     if (!isready) {                        if ((readSize - lastReadSize) > READY_BUFF) {                            lastReadSize = readSize;                            mHandler.sendEmptyMessage(CACHE_VIDEO_READY);                        }                    } else {                        if ((readSize - lastReadSize) > CACHE_BUFF                                * (errorCnt + 1)) {                            lastReadSize = readSize;                            mHandler.sendEmptyMessage(CACHE_VIDEO_UPDATE);                        }                    }                }                 mHandler.sendEmptyMessage(CACHE_VIDEO_END);            } catch (Exception e) {                e.printStackTrace();            } finally {                if (out != null) {                    try {                        out.close();                    } catch (IOException e) {                        //                    }                }                 if (is != null) {                    try {                        is.close();                    } catch (IOException e) {                        //                    }                }            }         }    }).start(); } private final static int VIDEO_STATE_UPDATE = 0;private final static int CACHE_VIDEO_READY = 1;private final static int CACHE_VIDEO_UPDATE = 2;private final static int CACHE_VIDEO_END = 3; private final Handler mHandler = new Handler() {    @Override    public void handleMessage(Message msg) {        switch (msg.what) {        case VIDEO_STATE_UPDATE:            double cachepercent = readSize * 100.00 / mediaLength * 1.0;            String s = String.format("已缓存: [%.2f%%]", cachepercent);             if (mVideoView.isPlaying()) {                curPosition = mVideoView.getCurrentPosition();                int duration = mVideoView.getDuration();                duration = duration == 0 ? 1 : duration;                 double playpercent = curPosition * 100.00 / duration * 1.0;                 int i = curPosition / 1000;                int hour = i / (60 * 60);                int minute = i / 60 % 60;                int second = i % 60;                 s += String.format(" 播放: %02d:%02d:%02d [%.2f%%]", hour,                        minute, second, playpercent);            }             tvcache.setText(s);             mHandler.sendEmptyMessageDelayed(VIDEO_STATE_UPDATE, 1000);            break;         case CACHE_VIDEO_READY:            isready = true;            mVideoView.setVideoPath(localUrl);            mVideoView.start();            break;         case CACHE_VIDEO_UPDATE:            if (iserror) {                mVideoView.setVideoPath(localUrl);                mVideoView.start();                iserror = false;            }            break;         case CACHE_VIDEO_END:            if (iserror) {                mVideoView.setVideoPath(localUrl);                mVideoView.start();                iserror = false;            }            break;        }         super.handleMessage(msg);    }};}

总体来说，原理比较简单，就是把视频加载了一段后，就送到播放器播放，如果出现了错误，则优先缓存一部分文件，然后再继续播放，类似的处理过程循环往复。

程序源代码下载： code

大家可以在实际环境中做测试，和依据实际情况动态维护缓存区，在具体的使用过程中有神马问题留言即可！